Gemstone



FIG. 1 is a top plan view of a gemstone showing my new design;

FIG. 2 is a bottom plan view;

FIG. 3 is a rear elevational view;

FIG. 4 is a right side elevational view, the left side elevational viewbeing a mirror image thereof; and,

FIG. 5 is a front elevational view.

I claim the ornamental design for a gemstone, as shown and described.